A woman admires a necklace and her boyfriend present. The necklace has a green stone as a pendant.
Soon enough, the woman is killed for being in possession of the necklace.
Cut to some time later and a group of college kids are on a trip with their professor Dr Dennis.
The rest of the group consists of Chris, Jake, Isabella, Lilly and Oz.
Chris and Isabella are dating and the rest of the group finds Chris too annoying to hang out with.
When a skeleton of a woman wearing a necklace is found, Isabella wants to report it but doing so would cause the trip to be cut short and the group will have to have their lessons in a classroom rather than go on an excursion and get some real-life experience... To look for the sasquatch. Isabella however removes the necklace from the skeleton and keeps it.
And of course, they choose a time in the year known as the Dead Month where Big Foot sightings have been known to increase.
Lilly is the group's "I'm going to roll my eyes at everyone" character. She has enough attitude for everyone to avoid her and most of them do except for the boyfriend from the first scene whose name was Everett.
He kidnaps Lilly and ties her up to lure the monster. She hurls a couple of insults at him but Everett couldn't be bothered.
Meanwhile, Isabella is attacked by a beast and when she returns it is clear she is possessed.
More people die including the professor.
The beasts make it into the cabin where they are staying and Chris has to hide around the house.
Lilly manages to escape and come to the house only to tell Chris she is going to save her own skin and he can come or not. Chris wants to be a hero and try to save anyone else left in the group. There is no one left so he escapes with Lilly who did stay back for him after all.
She isn't rewarded for her kind gesture and when Chris and she are attacked, she is ripped apart and is left screaming in pain while Chris asks her to look at him. She doesn't and dies.The monster beasts close in and Chris readies himself for a battle but before that, the Wendigo and Sasquatch get into a fight. Bigfoot kills all the monsters.
Chris gets to escape only to be accosted by Isabella who jumps in front of his car.
The car doesn't start and Chris doesn't bother with rolling up the windows. So Isabella makes a grab for him and he gets out and jumps to the back of the truck where there is a canister of gasoline. And matches.
Isabella is set on fire and Chris ends up with his pants on fire which he quickly removes.
He is about to leave again but Everett comes, possessed by the Wendigo.
Everett is beheaded by Chris with the shovel he holds.Chris now has to hike back home, pantless but fortunately, there is a car going by and an old man asks what happened.
Dead month says the driver.
Everyone knows about it. People go missing in the woods all the time. But the authorities can hardly be bothered and don't discourage adventurers. (thanks to darkhorrortales)